川东北元坝地区三叠系须三段沉积特征及成岩作用

doi:10.12108/yxyqc.20210302

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 13-26.doi: 10.12108/yxyqc.20210302

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Sedimentary characteristics and diagenesis of the third member of Triassic Xujiahe Formation in Yuanba area, northeastern Sichuan Basin

ZHENG Rongchen^1,2, LI Hongtao^1,2, SHI Yunqing^1,2, XIAO Kaihua^1,2

1. Research Institute of Exploration and Production, Sinopec, Beijing 100083, China;
2. Key Laboratory for Marine Oil and Gas Exploitation, Sinopec, Beijing 100083, China

Received:2020-04-29 Revised:2020-07-25 Published:2021-06-03

Abstract

Abstract: Medium and high production commercial gas flow was found from several wells of the third member of Upper Triassic Xujiahe Formation in Yuanba area of northeastern Sichuan Basin，which shows better exploration and development potential here. The controlling factors of reservoir development of the third member of Xujiahe Formation are not clearly understood，which restricts the exploration and development deployment. The data of core observation，thin section identification and physical property analysis were used to study the reservoir characteristics and diagenesis of Xu 3 member，and the control of sedimentation and diagenesis on reservoir development was analyzed. The results show that the strata of Xu 3 member are relatively instable in thickness with the characteristics of thick in northwest and thin in southeast，and belong to progradational braided river delta deposits. Reservoir rocks，which mainly belong to calcarenaceous sandstones with the characteristics of dissolved pores， microscopic dissolved pores，have the characteristics of super-low porosity and super-low permeability with strong heterogeneity. Reservoir diagenesis mainly includes compaction，cementation，dissolution，recrystallization and fracturing. For pore development，constructive diagenesis mainly includes burial dissolution and fracturing， and compaction and calcite cementation belong to important destructive diagenesis. In Yuanba area，calcarenaceous sandstones deposited in the braided river delta plain-front are the most favorable sedimentary microfacies. For reservoir development，the burial dissolution diagenesis could be controlled by the relatively coal-rich sedimentary environment of braided river delta plain-front to a certain extent. In conclusion，the sedimentary microfacies of underwater distributary channel and plain distributary channel in braided river delta front and plain is the foundation of pore development of calcareous sandstone of Xu 3 member. Diagenesis such as burial dissolution and fracturing is conducive to the formation and improvement of reservoir pores. Therefore，the relatively developed areas of thin coal seam or coal seam interlayer in distributary channel and the relatively developed area of faults and fractures may be favorable for reservoir development district.

Key words: calcarenaceous sandstones, sedimentary facies, reservoir, diagenesis, the third member of Xujiahe Formation, Yuanba area in northeastern Sichuan Basin

CLC Number:

TE121.3

ZHENG Rongchen, LI Hongtao, SHI Yunqing, XIAO Kaihua. Sedimentary characteristics and diagenesis of the third member of Triassic Xujiahe Formation in Yuanba area, northeastern Sichuan Basin[J].Lithologic Reservoirs, 2021, 33(3): 13-26.

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Sedimentary characteristics and diagenesis of the third member of Triassic Xujiahe Formation in Yuanba area, northeastern Sichuan Basin

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